source/utils/smbpasswd.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Copyright (C) Jeremy Allison 1995-1998
   4  * Copyright (C) Tim Potter     2001
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 3 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "includes.h"
  20
  21 extern bool AllowDebugChange;
  22
  23 /*
  24  * Next two lines needed for SunOS and don't
  25  * hurt anything else...
  26  */
  27 extern char *optarg;
  28 extern int optind;
  29
  30 /* forced running in root-mode */
  31 static bool got_username = False;
  32 static bool stdin_passwd_get = False;
  33 static fstring user_name;
  34 static char *new_passwd = NULL;
  35 static const char *remote_machine = NULL;
  36
  37 static fstring ldap_secret;
  38
  39
  40 /*********************************************************
  41  Print command usage on stderr and die.
  42 **********************************************************/
  43 static void usage(void)
  44 {
  45         printf("When run by root:\n");
  46         printf("    smbpasswd [options] [username]\n");
  47         printf("otherwise:\n");
  48         printf("    smbpasswd [options]\n\n");
  49
  50         printf("options:\n");
  51         printf("  -L                   local mode (must be first option)\n");
  52         printf("  -h                   print this usage message\n");
  53         printf("  -s                   use stdin for password prompt\n");
  54         printf("  -c smb.conf file     Use the given path to the smb.conf file\n");
  55         printf("  -D LEVEL             debug level\n");
  56         printf("  -r MACHINE           remote machine\n");
  57         printf("  -U USER              remote username\n");
  58
  59         printf("extra options when run by root or in local mode:\n");
  60         printf("  -a                   add user\n");
  61         printf("  -d                   disable user\n");
  62         printf("  -e                   enable user\n");
  63         printf("  -i                   interdomain trust account\n");
  64         printf("  -m                   machine trust account\n");
  65         printf("  -n                   set no password\n");
  66         printf("  -W                   use stdin ldap admin password\n");
  67         printf("  -w PASSWORD          ldap admin password\n");
  68         printf("  -x                   delete user\n");
  69         printf("  -R ORDER             name resolve order\n");
  70
  71         exit(1);
  72 }
  73
  74 static void set_line_buffering(FILE *f)
  75 {
  76         setvbuf(f, NULL, _IOLBF, 0);
  77 }
  78
  79 /*******************************************************************
  80  Process command line options
  81  ******************************************************************/
  82
  83 static int process_options(int argc, char **argv, int local_flags)
  84 {
  85         int ch;
  86         const char *configfile = get_dyn_CONFIGFILE();
  87
  88         local_flags |= LOCAL_SET_PASSWORD;
  89
  90         ZERO_STRUCT(user_name);
  91
  92         user_name[0] = '\0';
  93
  94         while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:LW")) != EOF) {
  95                 switch(ch) {
  96                 case 'L':
  97 #if !defined(NSS_WRAPPER)
  98                         if (getuid() != 0) {
  99                                 fprintf(stderr, "smbpasswd -L can only be used by root.\n");
 100                                 exit(1);
 101                         }
 102 #endif
 103                         local_flags |= LOCAL_AM_ROOT;
 104                         break;
 105                 case 'c':
 106                         configfile = optarg;
 107                         break;
 108                 case 'a':
 109                         local_flags |= LOCAL_ADD_USER;
 110                         break;
 111                 case 'x':
 112                         local_flags |= LOCAL_DELETE_USER;
 113                         local_flags &= ~LOCAL_SET_PASSWORD;
 114                         break;
 115                 case 'd':
 116                         local_flags |= LOCAL_DISABLE_USER;
 117                         local_flags &= ~LOCAL_SET_PASSWORD;
 118                         break;
 119                 case 'e':
 120                         local_flags |= LOCAL_ENABLE_USER;
 121                         local_flags &= ~LOCAL_SET_PASSWORD;
 122                         break;
 123                 case 'm':
 124                         local_flags |= LOCAL_TRUST_ACCOUNT;
 125                         break;
 126                 case 'i':
 127                         local_flags |= LOCAL_INTERDOM_ACCOUNT;
 128                         break;
 129                 case 'j':
 130                         d_printf("See 'net join' for this functionality\n");
 131                         exit(1);
 132                         break;
 133                 case 'n':
 134                         local_flags |= LOCAL_SET_NO_PASSWORD;
 135                         local_flags &= ~LOCAL_SET_PASSWORD;
 136                         new_passwd = smb_xstrdup("NO PASSWORD");
 137                         break;
 138                 case 'r':
 139                         remote_machine = optarg;
 140                         break;
 141                 case 's':
 142                         set_line_buffering(stdin);
 143                         set_line_buffering(stdout);
 144                         set_line_buffering(stderr);
 145                         stdin_passwd_get = True;
 146                         break;
 147                 case 'w':
 148                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 149                         fstrcpy(ldap_secret, optarg);
 150                         break;
 151                 case 'R':
 152                         lp_set_name_resolve_order(optarg);
 153                         break;
 154                 case 'D':
 155                         DEBUGLEVEL = atoi(optarg);
 156                         break;
 157                 case 'U': {
 158                         got_username = True;
 159                         fstrcpy(user_name, optarg);
 160                         break;
 161                 case 'W':
 162                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 163                         *ldap_secret = '\0';
 164                         break;
 165                 }
 166                 case 'h':
 167                 default:
 168                         usage();
 169                 }
 170         }
 171
 172         argc -= optind;
 173         argv += optind;
 174
 175         switch(argc) {
 176         case 0:
 177                 if (!got_username)
 178                         fstrcpy(user_name, "");
 179                 break;
 180         case 1:
 181                 if (!(local_flags & LOCAL_AM_ROOT)) {
 182                         usage();
 183                 } else {
 184                         if (got_username) {
 185                                 usage();
 186                         } else {
 187                                 fstrcpy(user_name, argv[0]);
 188                         }
 189                 }
 190                 break;
 191         default:
 192                 usage();
 193         }
 194
 195         if (!lp_load(configfile,True,False,False,True)) {
 196                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 197                         configfile);
 198                 exit(1);
 199         }
 200
 201         return local_flags;
 202 }
 203
 204 /*************************************************************
 205  Utility function to prompt for new password.
 206 *************************************************************/
 207 static char *prompt_for_new_password(bool stdin_get)
 208 {
 209         char *p;
 210         fstring new_pw;
 211
 212         ZERO_ARRAY(new_pw);
 213
 214         p = get_pass("New SMB password:", stdin_get);
 215
 216         fstrcpy(new_pw, p);
 217         SAFE_FREE(p);
 218
 219         p = get_pass("Retype new SMB password:", stdin_get);
 220
 221         if (strcmp(p, new_pw)) {
 222                 fprintf(stderr, "Mismatch - password unchanged.\n");
 223                 ZERO_ARRAY(new_pw);
 224                 SAFE_FREE(p);
 225                 return NULL;
 226         }
 227
 228         return p;
 229 }
 230
 231
 232 /*************************************************************
 233  Change a password either locally or remotely.
 234 *************************************************************/
 235
 236 static NTSTATUS password_change(const char *remote_mach, char *username,
 237                                 char *old_passwd, char *new_pw,
 238                                 int local_flags)
 239 {
 240         NTSTATUS ret;
 241         char *err_str = NULL;
 242         char *msg_str = NULL;
 243
 244         if (remote_mach != NULL) {
 245                 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
 246                                                         LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
 247                         /* these things can't be done remotely yet */
 248                         return NT_STATUS_UNSUCCESSFUL;
 249                 }
 250                 ret = remote_password_change(remote_mach, username,
 251                                              old_passwd, new_pw, &err_str);
 252                 if (err_str != NULL)
 253                         fprintf(stderr, "%s", err_str);
 254                 SAFE_FREE(err_str);
 255                 return ret;
 256         }
 257
 258         ret = local_password_change(username, local_flags, new_pw,
 259                                      &err_str, &msg_str);
 260
 261         if(msg_str)
 262                 printf("%s", msg_str);
 263         if(err_str)
 264                 fprintf(stderr, "%s", err_str);
 265
 266         SAFE_FREE(msg_str);
 267         SAFE_FREE(err_str);
 268         return ret;
 269 }
 270
 271 /*******************************************************************
 272  Store the LDAP admin password in secrets.tdb
 273  ******************************************************************/
 274 static bool store_ldap_admin_pw (char* pw)
 275 {
 276         if (!pw)
 277                 return False;
 278
 279         if (!secrets_init())
 280                 return False;
 281
 282         return secrets_store_ldap_pw(lp_ldap_admin_dn(), pw);
 283 }
 284
 285
 286 /*************************************************************
 287  Handle password changing for root.
 288 *************************************************************/
 289
 290 static int process_root(int local_flags)
 291 {
 292         struct passwd  *pwd;
 293         int result = 0;
 294         char *old_passwd = NULL;
 295
 296         if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
 297                 char *ldap_admin_dn = lp_ldap_admin_dn();
 298                 if ( ! *ldap_admin_dn ) {
 299                         DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
 300                         goto done;
 301                 }
 302
 303                 printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
 304                 if ( ! *ldap_secret ) {
 305                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 306                         fstrcpy(ldap_secret, new_passwd);
 307                 }
 308                 if (!store_ldap_admin_pw(ldap_secret)) {
 309                         DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
 310                 }
 311                 goto done;
 312         }
 313
 314         /* Ensure passdb startup(). */
 315         if(!initialize_password_db(False, NULL)) {
 316                 DEBUG(0, ("Failed to open passdb!\n"));
 317                 exit(1);
 318         }
 319
 320         /* Ensure we have a SAM sid. */
 321         get_global_sam_sid();
 322
 323         /*
 324          * Ensure both add/delete user are not set
 325          * Ensure add/delete user and either remote machine or join domain are
 326          * not both set.
 327          */
 328         if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
 329            ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
 330                 (remote_machine != NULL))) {
 331                 usage();
 332         }
 333
 334         /* Only load interfaces if we are doing network operations. */
 335
 336         if (remote_machine) {
 337                 load_interfaces();
 338         }
 339
 340         if (!user_name[0] && (pwd = getpwuid_alloc(talloc_autofree_context(), geteuid()))) {
 341                 fstrcpy(user_name, pwd->pw_name);
 342                 TALLOC_FREE(pwd);
 343         }
 344
 345         if (!user_name[0]) {
 346                 fprintf(stderr,"You must specify a username\n");
 347                 exit(1);
 348         }
 349
 350         if (local_flags & LOCAL_TRUST_ACCOUNT) {
 351                 /* add the $ automatically */
 352                 static fstring buf;
 353
 354                 /*
 355                  * Remove any trailing '$' before we
 356                  * generate the initial machine password.
 357                  */
 358
 359                 if (user_name[strlen(user_name)-1] == '$') {
 360                         user_name[strlen(user_name)-1] = 0;
 361                 }
 362
 363                 if (local_flags & LOCAL_ADD_USER) {
 364                         SAFE_FREE(new_passwd);
 365                         new_passwd = smb_xstrdup(user_name);
 366                         strlower_m(new_passwd);
 367                 }
 368
 369                 /*
 370                  * Now ensure the username ends in '$' for
 371                  * the machine add.
 372                  */
 373
 374                 slprintf(buf, sizeof(buf)-1, "%s$", user_name);
 375                 fstrcpy(user_name, buf);
 376         } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
 377                 static fstring buf;
 378
 379                 if ((local_flags & LOCAL_ADD_USER) && (new_passwd == NULL)) {
 380                         /*
 381                          * Prompt for trusting domain's account password
 382                          */
 383                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 384                         if(!new_passwd) {
 385                                 fprintf(stderr, "Unable to get newpassword.\n");
 386                                 exit(1);
 387                         }
 388                 }
 389
 390                 /* prepare uppercased and '$' terminated username */
 391                 slprintf(buf, sizeof(buf) - 1, "%s$", user_name);
 392                 fstrcpy(user_name, buf);
 393
 394         } else {
 395
 396                 if (remote_machine != NULL) {
 397                         old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
 398                 }
 399
 400                 if (!(local_flags & LOCAL_SET_PASSWORD)) {
 401
 402                         /*
 403                          * If we are trying to enable a user, first we need to find out
 404                          * if they are using a modern version of the smbpasswd file that
 405                          * disables a user by just writing a flag into the file. If so
 406                          * then we can re-enable a user without prompting for a new
 407                          * password. If not (ie. they have a no stored password in the
 408                          * smbpasswd file) then we need to prompt for a new password.
 409                          */
 410
 411                         if(local_flags & LOCAL_ENABLE_USER) {
 412                                 struct samu *sampass = NULL;
 413
 414                                 sampass = samu_new( NULL );
 415                                 if (!sampass) {
 416                                         fprintf(stderr, "talloc fail for struct samu.\n");
 417                                         exit(1);
 418                                 }
 419                                 if (!pdb_getsampwnam(sampass, user_name)) {
 420                                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 421                                                 user_name );
 422                                         exit(1);
 423                                 }
 424
 425                                 if(pdb_get_nt_passwd(sampass) == NULL) {
 426                                         local_flags |= LOCAL_SET_PASSWORD;
 427                                 }
 428                                 TALLOC_FREE(sampass);
 429                         }
 430                 }
 431
 432                 if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
 433                         struct passwd *passwd;
 434
 435                         if (remote_machine == NULL) {
 436                                 passwd = getpwnam_alloc(NULL, user_name);
 437
 438                                 if (!passwd) {
 439                                         fprintf(stderr, "Cannot locate Unix account for "
 440                                                 "'%s'!\n", user_name);
 441                                         exit(1);
 442                                 }
 443                                 TALLOC_FREE(passwd);
 444                         }
 445
 446                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 447
 448                         if(!new_passwd) {
 449                                 fprintf(stderr, "Unable to get new password.\n");
 450                                 exit(1);
 451                         }
 452                 }
 453         }
 454
 455         if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name,
 456                                              old_passwd, new_passwd,
 457                                              local_flags))) {
 458                 fprintf(stderr,"Failed to modify password entry for user %s\n", user_name);
 459                 result = 1;
 460                 goto done;
 461         }
 462
 463         if(remote_machine) {
 464                 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
 465         } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
 466                 struct samu *sampass = NULL;
 467
 468                 sampass = samu_new( NULL );
 469                 if (!sampass) {
 470                         fprintf(stderr, "talloc fail for struct samu.\n");
 471                         exit(1);
 472                 }
 473
 474                 if (!pdb_getsampwnam(sampass, user_name)) {
 475                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 476                                 user_name );
 477                         exit(1);
 478                 }
 479
 480                 printf("Password changed for user %s.", user_name );
 481                 if(pdb_get_acct_ctrl(sampass)&ACB_DISABLED) {
 482                         printf(" User has disabled flag set.");
 483                 }
 484                 if(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) {
 485                         printf(" User has no password flag set.");
 486                 }
 487                 printf("\n");
 488                 TALLOC_FREE(sampass);
 489         }
 490
 491  done:
 492         SAFE_FREE(new_passwd);
 493         return result;
 494 }
 495
 496
 497 /*************************************************************
 498  Handle password changing for non-root.
 499 *************************************************************/
 500
 501 static int process_nonroot(int local_flags)
 502 {
 503         struct passwd  *pwd = NULL;
 504         int result = 0;
 505         char *old_pw = NULL;
 506         char *new_pw = NULL;
 507
 508         if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
 509                 /* Extra flags that we can't honor non-root */
 510                 usage();
 511         }
 512
 513         if (!user_name[0]) {
 514                 pwd = getpwuid_alloc(talloc_autofree_context(), getuid());
 515                 if (pwd) {
 516                         fstrcpy(user_name,pwd->pw_name);
 517                         TALLOC_FREE(pwd);
 518                 } else {
 519                         fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
 520                         exit(1);
 521                 }
 522         }
 523
 524         /*
 525          * A non-root user is always setting a password
 526          * via a remote machine (even if that machine is
 527          * localhost).
 528          */
 529
 530         load_interfaces(); /* Delayed from main() */
 531
 532         if (remote_machine == NULL) {
 533                 remote_machine = "127.0.0.1";
 534         }
 535
 536         if (remote_machine != NULL) {
 537                 old_pw = get_pass("Old SMB password:",stdin_passwd_get);
 538         }
 539
 540         if (!new_passwd) {
 541                 new_pw = prompt_for_new_password(stdin_passwd_get);
 542         }
 543         else
 544                 new_pw = smb_xstrdup(new_passwd);
 545
 546         if (!new_pw) {
 547                 fprintf(stderr, "Unable to get new password.\n");
 548                 exit(1);
 549         }
 550
 551         if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name, old_pw,
 552                                              new_pw, 0))) {
 553                 fprintf(stderr,"Failed to change password for %s\n", user_name);
 554                 result = 1;
 555                 goto done;
 556         }
 557
 558         printf("Password changed for user %s\n", user_name);
 559
 560  done:
 561         SAFE_FREE(old_pw);
 562         SAFE_FREE(new_pw);
 563
 564         return result;
 565 }
 566
 567
 568
 569 /*********************************************************
 570  Start here.
 571 **********************************************************/
 572 int main(int argc, char **argv)
 573 {
 574         TALLOC_CTX *frame = talloc_stackframe();
 575         int local_flags = 0;
 576         int ret;
 577
 578         AllowDebugChange = False;
 579
 580 #if defined(HAVE_SET_AUTH_PARAMETERS)
 581         set_auth_parameters(argc, argv);
 582 #endif /* HAVE_SET_AUTH_PARAMETERS */
 583
 584         if (getuid() == 0) {
 585                 local_flags = LOCAL_AM_ROOT;
 586         }
 587
 588         load_case_tables();
 589
 590         local_flags = process_options(argc, argv, local_flags);
 591
 592         setup_logging("smbpasswd", True);
 593
 594         /*
 595          * Set the machine NETBIOS name if not already
 596          * set from the config file.
 597          */
 598
 599         if (!init_names())
 600                 return 1;
 601
 602         /* Check the effective uid - make sure we are not setuid */
 603         if (is_setuid_root()) {
 604                 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
 605                 exit(1);
 606         }
 607
 608         if (local_flags & LOCAL_AM_ROOT) {
 609                 secrets_init();
 610                 return process_root(local_flags);
 611         }
 612
 613         ret = process_nonroot(local_flags);
 614         TALLOC_FREE(frame);
 615         return ret;
 616 }